Adaptive Evolution of Large Subunits of RubisCO in Magnoliophyta Crops  

木兰门作物RubisCO大亚基的分子适应性进化研究

作　　者：刘晗[1] 王丽坤[1] 熊冬金[1] 

机构地区：[1]南昌大学生命科学与食品工程学院,江西南昌330031

出　　处：《Agricultural Science & Technology》2009年第4期8-11,18,共5页农业科学与技术（英文版）

摘　　要：[Objective] The aim was to study adaptive evolution of the large subunits of RubisCO in Magnoliophyta crops. [Method] Taking Magnoliophyta crops such as corn and rice as research materials, the analysis on molecular adaptive evolution was carded out by using codon replacement and maximum likelihood methods. [ Result] The RubisCO suffered positive selection effect and six amino acid sites were identified. [ Conclusion] The six amino acid sites are of important guiding significance for studying catalytic activity of RubisCO large subunits and crop improvement.分子进化中发生正选择的一个标志是密码子的错义替换（dN，氨基酸替代）比同义替换（dS，氨基酸不变）有更高的替换速率，计算dN与dS之比ω能衡量蛋白质的进化趋势和所受到进化压力的大小。ω=1、〈1和〉1分别说明蛋白质在进化过程中受到中性选择、负选择和正选择。

关 键 词：Magnoliophyta crops Ribulose-1 5-biphosphate carboxylase/oxgenase rbcL gene Positive selection 

分 类 号：S184[农业科学—农业基础科学]